(57) A POS loop switching apparatus includes a switching circuit (l5) for selectively
connecting first and second transmission lines, to which at least one Point Of Sales
(POS) terminal (l8A, l8B) is connected, and first and second file control means (llA,
llB) for periodically supplying a control signal, so as to constitute at least one
closed loop, and switch control means (l6A, l6B, l7) for supplying a first switching
signal to a switching circuit (l5), in response to control signals from the first
and second file control means (llA, llB), to cause the switching circuit (l5) to connect
the first and second file control means (llA, llB) respectively to the first and second
transmission lines, thereby to constitute first and second closed loops, and when
one of the first and second file control means (llA, llB) does not generate a control
signal over a predetermined period of time, for supplying a second switching signal
to the switching circuit (l5), to cause the switching circuit (l5) to connect one
of first and second transmission lines connected to the file control means (llA or
llB) which does not generate the control signal, to the other file control means (llB
or llA), so as to constitute a new closed loop by the transmission line, the other
file control means (llB or llA), and the other transmission line which was connected
to the other file control means (llA or llB).
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